Door-closing apparatus



R. L. JEWELL nopR CLOSING APPARATUS it is desirable to form an emergency operating mechanism whereby the operation of unlocking may be brought about manually from without the chamber. To this end the pin 26 is extended to an opening 33 in a cap 34. By exerting sui'licient pressure on t 1e pin the locking device may be released.

What I claim as .new is l. In a cover closing apparatus; the co1n bination of a chamber; a cover on the chamber; closure securing mechanism on the cover; inea-ns tightening the mechanism and a locking device responsive to pressure inthe chamber locking the securing mechanism against release while permitting a tightening. movement of the means.

2. In a cover closing apparatus, the combination of a chamber; a cover on the chamber; closure securing mechanism comprising a tightening screw; and a locking device comprising. means locking the screw against turning in releasing direction only and mechanism responsive to the chamber pressure setting said means.

3. In a. cover closing apparatus, the combination of a chamber; a cover. on the chamber; closure securing mechanism comprising radial levers and a screw operating on the levers; and a locking device comprising means locking the screw against turning, and mechanism responsive to chamber pressure setting said means.

4. In a cover closing apparatus, the combination of a chamber; a cover on the chan1- ber; closure securing mechanism on the cover; comprising a post on the cover and a screw on the post exerting closure pressure on the cover; pressure responsive means on the chamber; a lock on the screw; and a connection between the lock and means.

5. Inka cover closing apparatus, the combination of a chamber; a cover on the chamber; closure securing mechanism on the cover; comprising a post on the cover and a screw on the post exerting closure pressure on the cover; pressure responsive means on the chamber; a lock on the screw; and a connection between the lock and means extending through the post.

(i. In a cover closing apparatus, the combination of a chamber; a cover on the chamber; a post on the cover; a nut on the post exerting closure pressure on the cover; a piu extending th rough the post; a diaphragm within the chamber; a lool; actuated by the diaphragm for locking the `pin against turning; and a locking connection between the pin and the nut.

T. In a cover closiiig apiaratus the combination ol a chamber; a cover on the chamber; closure securing mechanism on the cover; and a locking device responsive lo pressure in the chamber locking the securing mechanism against release, said locking device releasing only in response to a pressure below atmosphere in the chamber.

8. In a coveil closing apparatus, the combination ot' a chamber; a cover on the chamber; closure securing mechanisn'i on the cover; a locking device responsive to pressure in the chamber locking the securing mechanism against release; and manually operable mechanism for releasing said locking device.

9. In a cover closing apparatus; the combination of a chamber; a cover on the chamber; closure securing mechanism on the cover; a locking device responsive to pres sure in the chamber locking the securing mechanism against release; mechanism respending to a reduction of pressure in the chamber for releasing said locking device; and manually operable means 'for releasing said locking device.

In testimony whereof I have hereunto set m hand.

y RAYMOND L. JElVELL. 

